Chandelier with physics
You were probably searching for the wrong keywords for your tutorial, you may want to search for "Physics Chain" instead.

This one seems to put you in the right direction.

Anyway you will have to model your chain of links in some sort of rest pose, using the Physics tab in the 3D view Toolbar set all chain objects to Add Active except for the ends of the chains or any fixed objects they will attached to, which should be set to Add Passive instead.

For all of them make sure you change the Collision shape to Mesh under the Properties window > Physics Tab > Rigid Body Collisions Panel > Shape and the Source to Final if they are using any sort of modifiers.

Also set the Mass and Margin properties to a low value under the Rigid Body and Rigid Body Dynamics panels, like 0.001 depending on the dimensions your objects.



You will almost likely need to increase the precision steps of the simulation  to a higher value under Properties window > Scene Tab > Rigid Body World Panel > Steps per second. Probably a high value like 1200 or higher.

Also for simplicity sake if you have repeating parts in your lamp like equal chain strings you may want to make a group out of them and clone the group instance instead, so Blender will only calculate physics for one instance. Although if you plan to make it react to physics this will not work.